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EE216 Electronics -1
Lecture 29
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BJT Low Frequency Response-Basic Electronics and Transistor-Lecture Slides, Slides of Electronics
The course gives the students a sound knowledge of Fourier transforms along with Fourier integrals, partial differential equations, advanced vector analysis, complex variables and complex integrals. This lecture includes: BJT, High, Low, Frequency, Response, Analysis, Mid, band, Gain, Base, Resistance, Equivalent, Circuit, Coupling, Capacitance
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EE216 Electronics -
Lecture
EE-216 ELECTRONICS -I
EE216 Fall 2011
2
Acknowledgement:
The author of these slides acknowledges that
most of the slides used in this course have been taken from thecourse material provided in the CD accompanying the two text booksmentioned below.
Some of the slides have been modified and some
new slides have been added.
The author would like to appreciate
and give full credit to the efforts of the original creator of the slidesand would
categorically mention that the material used is
purely for academic purpose and not whatsoever forcommercial use.No commercial use of these slides is either intended and allthose accessing this material are advised to use this materialonly for academic
non-commercial purpose.
^
Microelectronic Circuits Sixth Edition,
by Sedra, Smith Oxford University Press
^
Fundamentals of Microelectronics, by Behzad Razavi, John Wiley & Sons Inc Modified by Assistant Professor Saleem Iftekhar, SEECS NUST
RECALL: BJT High Frequency Analysis
H
'
H
'
1
1
1
ω
ω^
s A
R C
R A sC
V V A^
M
sig in
sig M in
o sig
- ⇒ ≡ + = =
RECALL: BJT High Frequency Analysis
ⅴ⅘
BJT Mid-band Gain with
ⅴ
⅘
(^
L C m sig
B B
B B
M^
R R g R r R r R
r R r R
A
π
π
π
π
(^
L C m sig
B
B
o sig M v^
R R g R r R
r
R
V V
A
G^
π
π
^
sig
B B
B
L C m B
M
R r R r R r R R R g r R A
π
π π
π
(^
)^
(^
)
sig
sig B B
L C B
sig
B
B
L C B
M^
Rr
R R r R
R R R R r R r R
R
R
R
A
π
π
π
π
(^
)^
sig B sig B
sig B
L C B
sig B sig B
L C B
o sig M
R R R R r R R
R R R R R R R r
R
R
R
V V
A
π
π
β
β
(^
sig B
L C
sig B
B
M
R
R
r
R
R
R
R
R
A
β π
ⅴ⅘^
ⅴⅨ
⅙⅙❸
)
BJT Low Frequency Response (
⅙⅙❸
)
⅙⅙❸
)
BJT Low Frequency Response (
⅙⅙❸
)
ⅴ⅘^
ⅴⅨ
)
(^
L C m sig
B
B
o sig
M v^
R R g R r R
r R
V V
A G^
−
=
π
π
⅙⅙❸
)
The input side equivalent Circuit LFR (
⅙⅙❸
)
o s
s
s T
ω+
==) (
)
(
1
Where
1
1
sig
B C o P^
R r R C^
= ≡
π
ω ω
⅙⅙❸
)
BJT Low Frequency Response (
⅙⅙❸
)
)
(
1 1
1
sig
B C
P^
R r R C^
=
π
ω
ⅴ⅘
ⅴⅨ
↉↕^
∄≐
- ∄^ ≐ −
⅙Ⅱ
)
BJT Low Frequency Response (
⅙Ⅱ
)
=
β
ω
1 1
2
sig B e E
P
R R r C
⅙Ⅱ
)
BJT Low Frequency Response (
⅙Ⅱ
)
ⅴ⅘
)
(^
L C m sig
B
B
M^
R R g R r R
r R
A^
−=
π
π
[^
]^
s A R R r C s
s A
V V s A^
M P
L C o C P P M
o sig
3
2
3
3
1
1
) (
ω
ω
ω^
- ⇒ + = + = =
⅙⅙❹
)
BJT Low Frequency Response (
⅙⅙❹
)
Combined BJT Low Frequency Response ) =^ )(
3
2
1
=
=
P
P
P
M
o sig
s
s
s
s
s
s
A
V V s A
ω
ω
ω
1
1
1
(^12)
2 2
1 1
^
≈
C C E E C C
L^
R C R C R C f
π
Example 5.19 S&S 5Ed